BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
Strasse Wheels
Post Reply
 
Thread Tools Search this Thread
      04-05-2012, 04:05 PM   #1
jamze132
Second Lieutenant
jamze132's Avatar
Germany
8
Rep
267
Posts

Drives: 228i
Join Date: Nov 2011
Location: San Antonio, TX

iTrader: (0)

Please explain exhaust terminology - new guy here

A new exhaust seems to be pretty popular so can someone please explain, or point me in the right direction to figure out what the following terms mean?

cat back
axle back
test pipes
x pipes
connecting pipes


Can someone also explain why BMW didn't just put one of these nice after market exhausts on the car to begin with? Thanks!
Appreciate 0
      04-05-2012, 04:27 PM   #2
bilal
Enlisted Member
Lebanon
4
Rep
30
Posts

Drives: e93 m3
Join Date: Jun 2010
Location: lebanon

iTrader: (0)

sound. drone. and polution
Appreciate 0
      04-05-2012, 04:29 PM   #3
tibra1
Banned
No_Country
80
Rep
6,774
Posts

Drives: 2011 ZCP M3 - 2007 335i crashd
Join Date: Apr 2009
Location: NYC

iTrader: (4)

Oh boy
Appreciate 0
      04-05-2012, 04:45 PM   #4
JPatrick
Private First Class
JPatrick's Avatar
United_States
3
Rep
109
Posts

Drives: 2011.5 E90 M3
Join Date: Nov 2010
Location: Seattle, WA

iTrader: (0)

Garage List
2011 BMW M3  [0.00]
1998 BMW M3  [0.00]
Use of an internet search engine will yield plenty of results for each term.

BMW did put a nice exhaust system in their cars. People like to individualize their cars. There are also legal constraints as to what is allowed. That deters BMW, but not a lot of owners.
__________________
2011.5 E90 M3 - Space Gray/Extended Fox Red Leather/Sycamore Anthracite Trim, DCT, ZCP, everything except Moon Roof
Appreciate 0
      04-05-2012, 04:52 PM   #5
rjd598
Major General
rjd598's Avatar
United_States
138
Rep
5,260
Posts

Drives: 10' M3
Join Date: Jan 2009
Location: San Diego,CA

iTrader: (2)

Garage List
2010 BMW M3  [4.50]
1999 BMW M3  [0.00]
Quote:
Originally Posted by jamze132 View Post
A new exhaust seems to be pretty popular so can someone please explain, or point me in the right direction to figure out what the following terms mean?

cat back
axle back
test pipes
x pipes
connecting pipes


Can someone also explain why BMW didn't just put one of these nice after market exhausts on the car to begin with? Thanks!
simple search
http://m3forum.net/m3forum/showthread.php?t=370927
catbacks/axle backs=muffler and are the first part of the exhaust then comes the xpipe where cats and resonators are found
__________________
Appreciate 0
      04-05-2012, 05:15 PM   #6
THE TECH
BimmerPost Supporting Vendor
THE TECH's Avatar
United_States
172
Rep
13,119
Posts


Drives: BPMsport 2012 E92 M3
Join Date: Jun 2011
Location: Kansas

iTrader: (45)

Garage List
Send a message via AIM to THE TECH Send a message via Skype™ to THE TECH
:
__________________
Appreciate 0
      04-05-2012, 07:06 PM   #7
jamze132
Second Lieutenant
jamze132's Avatar
Germany
8
Rep
267
Posts

Drives: 228i
Join Date: Nov 2011
Location: San Antonio, TX

iTrader: (0)

Quote:
Originally Posted by rjd598 View Post
simple search
http://m3forum.net/m3forum/showthread.php?t=370927
catbacks/axle backs=muffler and are the first part of the exhaust then comes the xpipe where cats and resonators are found
Thank you for your help.
Appreciate 0
      04-06-2012, 11:07 AM   #8
drburton
Lieutenant
23
Rep
449
Posts

Drives: e92 M3 Alpine
Join Date: Feb 2008
Location: Minneapolis

iTrader: (3)

I think these terms have some level of variable meaning but here is an attempt:

Cat Back - used to refer to exhaust replacement from the secondary cat to the back of the car.

Axle Back - just the rear exhaust that would then hookup with the stock x-pipe. Many seems to use cat back and axle back interchangeable, but in my mind they are a bit different.

X-pipe - goes from headers to 'axle back' exhaust. This goes under the main cabin of the car and includes both sets of cats (primary and secondary). Most people who replace the x-pipe are doing so to remove the cats and have less restriction.

Test pipes - Probably referring to the Turner test pipes. This is a solution to replace the primary cat without getting a whole new x-pipe. So you cut the stock x-pipe and insert the test pipes in place of the primary cats.

Hope this helps.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 05:02 AM.




m3post
m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST